walkMap
AbstractMap's own {k=v, k2=v2}, so a walked map reads the same as an unwalked one — and SELF_RENDERING counts on it: change the format and an unchanged walk no longer IS toString().
AbstractMap's own {k=v, k2=v2}, so a walked map reads the same as an unwalked one — and SELF_RENDERING counts on it: change the format and an unchanged walk no longer IS toString().